Variable-head impeller mechanism



May l, 1928. 1,668,018

A. HOLLANDER VARIABLE HEAD IMPELLER MECHANISM Filed @EIL 19, 1927 @www Fig. I.

Iven tof' wlw M4N Patentedy May Yl, 1928.

i UNITED STATES N i 1,668,013 PATENTjoFFlcl-:g

ALAIDAB HOLLANDER, OF.BERIIELEY,'CALIFORNIA, ASSIGNOR T0 BYRON JLACISON PUMP MFG. C0., OF BERKELEY, CALIFORNIA, A CORIORATIONOF CALIFORNIA.

`vitamina Haan IMPELLEP. MncHANrsM.

Application filedl OctoberA 19, 1927. Serial No.` 227,310.

My invention is particularly applicable to centrifugal umps although it maybe used also for tur ine water wheels wherein the pressure or head under which the impeller operates varies over a wide range.

The invention is also applicable to the ex ceptional case Where radically differentV speeds of impeller operation are to be employed with the same head against or under which the impeller operates. v

It is to`be understood that the impeller diameter, its vane angles and other characteristics are functions of the head against whichthe impeller operates and the speed of rotation, and that-avariationv in either speed or head or both, involves a change in the the drawing and description below I have chosen a six thousand horsepower, three thousand gallon per minute pump adapted to operate under a delivery head having a seasonal variation of from 25 to 75 feet, that is a range of three hundred per cent, while attaining efficiency and superior operating characteristics throughout, and combine with simplicity of construction.

By referring to the drawing my invention will be made clear. y

Fig. 1 represents a vertical cross section through a submerged motor driven double centrifugal pump employing my invention with the parts assembled for operating under the lower head. v t v t Fig. 2 is a fragmentary cross section of the impeller and its associated elements with the parts assembled for the higher head.

Throu hout the figures similar numerals refer to identical part-s.

The operating motor is indicated by the numeral 1 adapted to drive the shaft'2 on which is mounted the impeller 3.

A volute casing into which the pumped water is discharged is indicated at 4.

The impeller 3 is of the do-uble type taking suction water through a lower passage as indicated by the arrow 5, and through the upper passage as indicated by the ,arrow 6 and imparting theretothenecessary kinetic energy to force the same through the volute 4 and against the delivery head.

' Where low heads are involved such as 25 to 40 feetv the impeller 3 having the diameter indicated by the dimension line 7 is rotated at the definite speedof the motor 1, and at suoli time the annular members 8 and 9 are bolted to and form a part of the volute casing, their inner faces 10 and 11 serving asaportion of the volute delivery passage, whereas when the higher heads are to be pumped the members 8 and 9 are disconnected from then casing and moved inward and are bolted to the impeller 3 when they becomea part of and a'continuation of the impeller, increasing its diameter to that shown by the dimension line 12.

rl'he diameter of the runner or impeller 12 introduces the necessary characteristics to enable the pump tooperate atthe same speed ofthe motor l, While deliveringthe higher head, that isfrom 40 to 75 feet.

klf the @aeration isunder the high head 40 to- 7 5 feet the parts are connected together as shown in Fig. 2, whereas under the lower heads 25vto 40 feet the impeller 3 is stri ped of the members 8 and 9 which are now Ifixed in the volute casing into the "position of Fig. l.

The changes of head here contemplated are seasonal changes making necessary the changing of the effective impeller diameter and characteristics only at long intervals.

As a varied application of my invention it will now be seen that the impeller having the diameter of 7 may be employed to pump a fixed head at one speed and the impeller having` diameter and characteristics 12 may be employed to pump the same head at a re duced speed.

`The gist of my invention is the modiiication vof the impeller diameter and characteristics to suit changed conditions of head or speed or head and speed.

It will also be obvious that if instead of employing the apparatus herein disclosed as a centrifugal pump to raise water when driven by a motor, it be employed as a turbine water wheel to generate power from falling water, and that in place of the motor 1 an electric generator be employed; the apparatus will function to drive the generator at a fixed speed under different heads corresponding with those to which the runner diameter and characteristics 7 and the runner diameter and characteristics 12 are adapted: or at relatively different speeds under the same head.

I claim:

1. In combination with an impeller and a volute casing, said casing chambered t0 receive and hold an impeller ring, an impeller ring of annular form adapted to be fixed about the periphery of said impeller and when so fixed to provide a continuation ofy said impeller blades and passages and when unfixed to be displaced clear of said impeller and to be held in said casing chamber and positioned with one of its side faces to direct the discharge from said impeller.

2. In a centrifugal pump a double suction and double-discharge lmpeller mounted on a shaft and within a casing a chamber 0n each side of said casing and between said impeller periphery andsaidV casing, a pair of symmetrical ring members each adapted to normally repose in one of said chambers with theiropposed surfaces forming a discharge passage between the said impeller and the said casing, connecting means on each of said members constructed 'and adapted to secure said members adjacent each other and to said impeller and then forming a continuation of said impeller and thus an impeller of greater diameter and new characteristics.

3. 'In a` centrifugal pump, an impeller, a casing having receiving space for ring means, ring means constructed and adapted when secured to said im eller to increase the diameter of said imp er` and when unfixed to be shifted into said space and remaln stationary.

4. In a Acentrifugal pump, an impe11er,.:a casing having receiving space for vring means,` ring means constructed and adapted when secured to said impeller to increase the diameter of said impeller and when unfixed to be shifted into said space and remain stationary, means fixing said ring means in said space.Y e

5. In a centrifugal pump, an impeller, a casing having receiving space for ring means, ring means constructed and adapted When secured to'said impeller to increase the diameter of said impeller and when unfixed to be shifted into said space and remain stationary, the face of said ring means forming a surface over which the impeller is adapted to discharge. v

6. In a centrifugal pump, an impeller, a cas'ng having receivingl spacel for ring means, ring means constructed and adapted when secured to` said impeller to increase the diameter of said impellerand when unfixed to be shifted into said space and remain stationary, the face of saidring means forming a surface over which the impeller is adapted to discharge, means fixing said ring meansl in said space.

ALADAR HOLLANDER. 

